Regeneration capacity control method for a battery

Abstract

A method for controlling regeneration of a battery includes determining a scaled value for a state of charge of the battery, a scaled value for a battery temperature and a scaled value for a maximum charging power of the battery. An actual battery temperature is then compared with a predetermined operating temperature. When the actual battery temperature is less than the predetermined operating temperature, an actual regeneration amount is calculated based upon the scaled value for the state of charge of the battery and the scaled value for the battery temperature. When the actual battery temperature is greater than the predetermined operating temperature, the actual regeneration amount is based upon the scaled value for the state of charge of the battery, the scaled value for the battery temperature, and the scaled value for the maximum charging power of the battery.

1. A method for controlling regeneration of a battery for a vehicle having an electrically variable transmission comprising:
 determining a scaled value for a state of charge of the battery,
 wherein the scaled value for the state of charge of the battery is proportional to an actual state of charge of the battery when the actual state of charge of the battery is between a first state of charge threshold and a second state of charge threshold, 
 wherein the scaled value for the state of charge of the battery is equal to 1.0 when the actual state of charge of the battery is less than the first state of charge threshold; and 
 wherein the scaled value for the state of charge of the battery is equal to 0.0 when the actual state of charge of the battery is greater than the second state of charge threshold; 
 
 determining a scaled value for a battery temperature,
 wherein the scaled value for the battery temperature is proportional to an actual battery temperature when the actual battery temperature is between a first temperature threshold and a second temperature threshold, 
 wherein the scaled value for the battery temperature is equal to 1.0 when the actual battery temperature is less than the first temperature threshold; and 
 wherein the scaled value for the battery temperature is equal to 0.0 when the actual battery temperature is greater than the second temperature threshold; 
 
 calculating an actual regeneration amount by multiplying the scaled value for the state of charge of the battery with the scaled value for the battery temperature and with a requested regeneration value; 
 controlling the regeneration of the battery for the vehicle according to the calculated regeneration amount; 
 wherein a state of charge range defined by the first state of charge threshold and the second state of charge threshold is greater than an ideal state of charge range for the battery; and 
 wherein a battery temperature range defined by the first temperature threshold and the second temperature threshold is greater than an ideal temperature range for the battery. 
 
     
     
       2. The method of  claim 1 , further comprising,
 determining a scaled value for a maximum charging power of the battery,
 wherein the scaled value for the maximum charging power of the battery is proportional to an actual charging power available for the battery when the actual charging power available for the battery is between a first power threshold and a second power threshold, 
 wherein the scaled value for the maximum charging power of the battery is equal to 1.0 when the actual charging power available for the battery is less than the first power threshold; and 
 wherein the scaled value for the maximum charging power of the battery is equal to 0.0 when the actual charging power available for the battery is greater than the second power threshold; and 
 
 comparing the actual battery temperature with a predetermined minimum operating temperature, the predetermined minimum operating temperature being less than the first temperature threshold; and 
 wherein calculating the actual regeneration amount further includes multiplying the product of the scaled value for the state of charge of the battery, the scaled value for a battery temperature, and the requested regeneration value with the scaled value for a maximum charging power of the battery when the actual battery temperature is greater than or equal to the predetermined minimum operating temperature. 
 
     
     
       3. A method for controlling regeneration of a battery:
 providing a requested regeneration amount; 
 determining a scaled value for a state of charge of the battery; 
 determining a scaled value for a temperature of the battery; 
 determining a scaled value for a maximum charging power of the battery; 
 comparing an actual battery temperature with a predetermined operating temperature; 
 calculating an actual regeneration amount by multiplying the scaled value for the state of charge of the battery, the scaled value for the battery temperature, and the requested regeneration amount, when the actual battery temperature is less than the predetermined operating temperature; and 
 calculating the actual regeneration amount by multiplying the scaled value for the state of charge of the battery, the scaled value for the battery temperature, the scaled value for a maximum charging power of the battery, and the requested regeneration amount, when the actual battery temperature is greater than or equal to the predetermined operating temperature; 
 controlling the regeneration of the battery for the vehicle according to the calculated regeneration amount; 
 wherein the scaled value for the state of charge of the battery is proportional to an actual state of charge of the battery when the actual state of charge of the battery is between a first state of charge threshold and a second state of charge threshold, 
 wherein the scaled value for the state of charge of the battery is equal to 1.0 when the actual state of charge of the battery is less than the first state of charge threshold; and 
 wherein the scaled value for the state of charge of the battery is equal to 0.0 when the actual state of charge of the battery is greater than the second state of charge threshold; and 
 wherein a state of charge range defined by the first state of charge threshold and the second state of charge threshold is greater than an ideal state of charge range for the battery. 
 
     
     
       4. The method of  claim 3 , wherein the scaled value for the battery temperature is proportional to an actual battery temperature when the actual battery temperature is between a first temperature threshold and a second temperature threshold,
 wherein the scaled value for the battery temperature is equal to 1.0 when the actual battery temperature is less than the first temperature threshold; and 
 wherein the scaled value for the battery temperature is equal to 0.0 when the actual battery temperature is greater than the second temperature threshold. 
 
     
     
       5. The method of  claim 4 , wherein a battery temperature range defined by the first temperature threshold and the second temperature threshold is greater than an ideal temperature range for the battery. 
     
     
       6. The method of  claim 4 , wherein the predetermined operating temperature is less than the first temperature threshold. 
     
     
       7. The method of  claim 3 , wherein the scaled value for the maximum charging power of the battery is proportional to an actual charging power available for the battery when the actual charging power available for the battery is between a first power threshold and a second power threshold,
 wherein the scaled value for the maximum charging power of the battery is equal to 1.0 when the actual charging power available for the battery is less than the first power threshold; and 
 wherein the scaled value for the maximum charging power of the battery is equal to 0.0 when the actual charging power available for the battery is greater than the second power threshold. 
 
     
     
       8. A method for controlling regeneration of a battery:
 providing a requested regeneration amount; 
 determining a scaled value for a state of charge of the battery; 
 determining a scaled value for a temperature of the battery; 
 determining a scaled value for a maximum charging power of the battery; 
 comparing an actual battery temperature with a predetermined operating temperature; 
 calculating an actual regeneration amount by multiplying the scaled value for the state of charge of the battery, the scaled value for the battery temperature, and the requested regeneration amount, when the actual battery temperature is less than the predetermined operating temperature; and 
 calculating the actual regeneration amount by multiplying the scaled value for the state of charge of the battery, the scaled value for the battery temperature, the scaled value for a maximum charging power of the battery, and the requested regeneration amount, when the actual battery temperature is greater than or equal to the predetermined operating temperature; and 
 controlling the regeneration of the battery for the vehicle according to the calculated regeneration amount; 
 wherein the scaled value for the battery temperature is proportional to an actual battery temperature when the actual battery temperature is between a first temperature threshold and a second temperature threshold, 
 wherein the scaled value for the battery temperature is equal to 1.0 when the actual battery temperature is less than the first temperature threshold; and 
 wherein the scaled value for the battery temperature is equal to 0.0 when the actual battery temperature is greater than the second temperature threshold; and 
 wherein a battery temperature range defined by the first temperature threshold and the second temperature threshold is greater than an ideal temperature range for the battery. 
 
     
     
       9. The method of  claim 8 , wherein a state of charge range defined by the first state of charge threshold and the second state of charge threshold is greater than an ideal state of charge range for the battery. 
     
     
       10. The method of  claim 8 , wherein the scaled value for the battery temperature is proportional to an actual battery temperature when the actual battery temperature is between a first temperature threshold and a second temperature threshold,
 wherein the scaled value for the battery temperature is equal to 1.0 when the actual battery temperature is less than the first temperature threshold; and 
 wherein the scaled value for the battery temperature is equal to 0.0 when the actual battery temperature is greater than the second temperature threshold. 
 
     
     
       11. The method of  claim 8  wherein the predetermined operating temperature is less than the first temperature threshold. 
     
     
       12. The method of  claim 8 , wherein the scaled value for the maximum charging power of the battery is proportional to an actual charging power available for the battery when the actual charging power available for the battery is between a first power threshold and a second power threshold,
 wherein the scaled value for the maximum charging power of the battery is equal to 1.0 when the actual charging power available for the battery is less than the first power threshold; and 
 wherein the scaled value for the maximum charging power of the battery is equal to 0.0 when the actual charging power available for the battery is greater than the second power threshold.